Starting with the Impressionists, artists have gone beyond what is visible to the eye and have plowed deeply into the inner workings of their subjects. Especially with portraits, it is crucial to bring out the inner feelings. How does an artist show the passion of her subject? Here I have heightened the feelings of sexual hunger with burning cheeks and an aura that could never be seen with the naked eye. Passion is hot and uncontrollable.
Here is a wonderful trailer from "All the Pretty Horses" where lust and love have dire consequences.